We have completed production in rabbits of potent antisera to the 90 classified rhinovirus serotypes by using methods previously described (M. K. Cooney and G. E. Kenny, Proc. Soc. Exp. Biol. Med. 133:645-650, 1970). Systematic testing by neutralization tests has revealed significant numbers of cross-relationships among rhinovirus types, some of which have already been reported. Herein, our observations are compared with cross-reactions reported in National Institutes of Health reference guinea pig antisera. Also, original rhinovirus isolates, representing serotypes known to be antigenically related to other rhinoviruses, were tested against rabbit antisera to the related serotypes. These tests revealed extensive antigenic variation among isolates identified as rhinovirus 12:78 or 36:58, which are reciprocally related pairs, 41, reciprocally related to 13, and 67, which is related to both 9 and 32. If the rhinovirus serotypes were grouped according to antigenic relationships, 50 types could be included in 16 groups.
SUMMARYIsolates of adenovirus types 1 and 2, obtained from 11 infants with prolonged faecal excretion (up to 515 days), were compared by DNA restriction analysis with seven standard endonucleases which recognize hexanucleotides and two additional endonucleases which recognize tetranucleotides. In all instances identical genome types were identified in isolates obtained early and late after infection. Our interpretation of these data is that a chronic persistent infection occurred in these children, and not a reinfection with the same serotype.
Antisera produced in rabbits to 37 rhinovirus (RV) types have been examined for antibody to the 36 corresponding heterologous types. Reciprocal neutralization was noted between RV types 2 and 49 and RV types 13 and 41. Five additional monotypic rhinoviral rabbit antisera neutralized one heterologous rhinovirus. Neutralizing antibody titers against heterologous RV serotypes were similar to those shown in the RV 1A, 1B and RV 9, 32 reciprocal cross-reactions, and would not be expected to result in false identification of serotypes. Comparison of neutralizing antibody titers and neutralization rate constants in serial serum specimens of immunized rabbits showed that antibody response to the immunizing RV type and the cross-reacting type followed a similar time pattern.
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